接著上篇來講php生命周期。

php_request_startup

這個(gè)階段和php_module_startup差不多，都是初始化工作，比php_module_startup簡單很多，可以自己看下，重點(diǎn)來看下執(zhí)行階段

php_execute_script

用gdb看看調(diào)用棧，gdb ./php

在php_execute_script打斷點(diǎn)，執(zhí)行，在看下調(diào)用棧，

b php_execute_script (gdb) r test.php bt #0  php_execute_script (primary_file=0x7fffffffe240)     at /www/test/php/php-7.4.3/main/main.c:2541 #1  0x00000000008bbd85 in do_cli (argc=2, argv=0x1425af0)     at /www/test/php/php-7.4.3/sapi/cli/php_cli.c:961 #2  0x00000000008bcd2d in main (argc=2, argv=0x1425af0)     at /www/test/php/php-7.4.3/sapi/cli/php_cli.c:1356

在調(diào)用?？梢郧宄吹綀?zhí)行流程，現(xiàn)在到/cli/php_cli.c文件看看做了哪些事情，

int c;     zend_file_handle file_handle;     int behavior = PHP_MODE_STANDARD;     char *reflection_what = NULL;     volatile int request_started = 0;     volatile int exit_status = 0;     char *php_optarg = NULL, *orig_optarg = NULL;     int php_optind = 1, orig_optind = 1;     char *exec_direct=NULL, *exec_run=NULL, *exec_begin=NULL, *exec_end=NULL;     char *arg_free=NULL, **arg_excp=&arg_free;     char *script_file=NULL, *translated_path = NULL;     int interactive=0;     int lineno = 0;     const char *param_error=NULL;     int hide_argv = 0;      zend_try {          CG(in_compilation) = 0; /* not initialized but needed for several options */          while ((c = php_getopt(argc, argv, OPTIONS, &php_optarg, &php_optind, 0, 2)) != -1) {             switch (c) {

初始化變量，解析命令到/main/main.c文件看看真正的執(zhí)行階段

PHPAPI int php_execute_script(zend_file_handle *primary_file) {     zend_file_handle *prepend_file_p, *append_file_p;     zend_file_handle prepend_file = {{0}, NULL, NULL, 0, 0}, append_file = {{0}, NULL, NULL, 0, 0}; #if HAVE_BROKEN_GETCWD     volatile int old_cwd_fd = -1; #else     char *old_cwd;     ALLOCA_FLAG(use_heap) #endif     int retval = 0;

加載要執(zhí)行的php文件，通過zend_compile_file進(jìn)行詞法分析 語法分析，生成AST，編譯成op_array，也就是指令集,
我們看下指令集，

b zend_execute c bt (gdb) p *op_array $1 = {type = 2 '